https://bugs.llvm.org/show_bug.cgi?id=49747
Bug ID: 49747
Summary: implicit instantiation of undefined template
'std::tuple_size<auto>'
Product: libc++
Version: 11.0
Hardware: PC
OS: All
Status: NEW
Severity: release blocker
Priority: P
Component: All Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Not sure if this is error is caused by the way `std::tuple_size` 's SFINAE is
implemented, and/or the way template-template-parameters are instanciated in
such context.
https://godbolt.org/z/GGs7ndKE4
```log
error: implicit instantiation of undefined template 'std::tuple_size<auto>'
```
Also, Clang-CL add this error message previously to the one mentioned above :
```log
error : cannot mangle this 'auto' type yet
```
See also the original discussion on SO :
https://stackoverflow.com/questions/66821952/clang-error-implicit-instantiation-of-undefined-template-stdtuple-sizeauto/66822584
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